Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf6ff3e88c072f8…

MALICIOUS

PDF

109.2 KB Created: 2020-06-13 07:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: a1a367475575b7162502b16f7d06011a SHA-1: 97e63ec5521507c93da5cbc55f6ed8e62864a3e8 SHA-256: acf6ff3e88c072f899f548167a821552b59d4d73868b976fdd3adcb1ca101232
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. The primary embedded URL, http://katskornerinternational.org/uploads/1/3/1/4/131438202/131438202.html#http%253A%252F%252Faznaysacbd.com%252Fuploads%252F1%252F2%252F9%252F4%252F129426716%252F129426716.html%253Fobra+de+teatro+de+los+tres+cerditos, is likely intended to redirect the user to a malicious site. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://katskornerinternational.org/uploads/1/3/1/4/131438202/131438202.html#http%253A%252F%252Faznaysacbd.com%252Fuploads%252F1%252F2%252F9%252F4%252F129426716%252F129426716.html%253Fobra+de+teatro+de+los+tres+cerditos PDF link annotation
    • http://4n4.undesirable.us/uploads/1/3/1/3/131380916/gekimob.pdfIn PDF document text
    • http://root.autumnlandcompany.com/uploads/1/3/1/3/131398564/c6d2aa31696.pdfIn PDF document text
    • http://altmaxconsulting.com/uploads/1/3/1/3/131398250/4909669.pdfIn PDF document text
    • http://fit2livesports.com/uploads/1/3/1/0/131070469/3ffeb95e90.pdfIn PDF document text
    • http://spanishmaincocoabeach.com/uploads/1/3/0/2/130272573/kitivo_dutesorodebiduv_jigur.pdfIn PDF document text
    • http://voteyesforourkids.org/uploads/1/3/1/4/131438814/guperuvipupivigawotu.pdfIn PDF document text
    • http://sabinescottage.com/uploads/1/3/0/5/130539205/8dd1a256db5d.pdfIn PDF document text
    • http://stillbestsilvetrucks.com/uploads/1/3/0/5/130588574/lojine.pdfIn PDF document text
    • http://asesoresdesegurosmanejar.com/uploads/1/3/1/4/131412858/tosowese-kuwisodejus-salamuvupem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://kidivemureb.files.wordpress.com/2020/06/diwevoruzenikesixazajanol.pdfIn PDF document text
    • https://mudidakadeza.files.wordpress.com/2020/06/81229177967.pdfIn PDF document text
    • https://zetamuse.files.wordpress.com/2020/06/nabinanemeti.pdfIn PDF document text
    • https://wekakera659813588.files.wordpress.com/2020/06/65185941110.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BE6 13028 bytes
SHA-256: 70eeae48ab5c004c4fe3a79e7862c3a648c46f9c62e815a0c4869c8c0a2e718f

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